The Computer one is wrong as far as the earliest version. the earliest computer would indeed take up a whole room but there was a series of holes in the computer, and it was someone's job to take a bunch of connecting wires and hook up the computer so it could run 1 mathematical formula, then after that was done they'd pull the wires and start again. the punch cards weren't used until after the time of charles babbage who first invented a computer which could read holes in a punch card.